There are two different types of proton’s speeds. One is the speed before it enters point P and one is the speed after it exits point P.

The proton will be moving at a faster speed before entering point P because once the proton passes through point P it will begin to slow down due to friction.

This means that the proton will be moving at a slower speed after exiting point p than before entering it.

If the proton were moving at the same speed after entering point P as it was before then it would be impossible for it to slow down because at the same speed it would have to enter and exit point P from the same direction.

This is impossible due to friction and other forces within point P that slow down a moving body.

What is the proton’s speed as it passes through point p?

## 1. The proton will be moving at a faster speed .

Before entering point P because once the proton passes through point P it will begin to slow down due to friction.

This means that the proton will be moving at a slower speed after exiting point p than before entering it.

If the proton were moving at the same speed after entering point P as it was before then it would be impossible for it to slow down because at the same speed it would have to enter and exit point P from the same direction.

This is impossible due to friction and other forces within point P that slow down a moving body.

## 2. The proton will be moving at a slower speed after exiting point P.

Since [C] refers to “the proton” here, the answer must clearly state that if something is moving faster, then its speed will decrease, and likewise if it was moving slower or had not moved, then its speed will increase.

The proton will be moving at a faster speed before entering point P because once the proton passes through point P it will begin to slow down due to friction.

This means that the proton will be moving at a slower speed after exiting point p than before entering it.

If the proton were moving at the same speed after entering point P as it was before then it would be impossible for it to slow down because at the same speed it would have to enter and exit point P from the same direction.

This is impossible due to friction and other forces within point P that slow down a moving body.

## 3. The proton’s speed before exiting point P.

The proton will be moving at a faster speed before entering point P because once the proton passes through point P it will begin to slow down due to friction.

This means that the proton will be moving at a slower speed after exiting point p than before entering it.

If the proton were moving at the same speed after entering point P as it was before then it would be impossible for it to slow down because at the same speed it would have to enter and exit point p from the same direction.

This is impossible due to friction and other forces within point p that slow down a moving body.

## 4. The proton’s speed after exiting point P.

The proton will be moving at a faster speed before entering point p because once the proton passes through point P it will begin to slow down due to friction.

This means that the protons will be moving at a slower speed after exiting point p than before entering it.

If the proton were moving at the same speed after entering point P as it was before then it would be impossible for it to slow down because at the same speed it would have to enter and exit point p from the same direction.

This is impossible due to friction and other forces within point p that slow down a moving body.

## 5. The proton will be moving at a slower speed after exiting point P than before entering it.

The proton will be moving at a faster speed before entering point P because once the proton passes through point P it will begin to slow down due to friction.

This means that the proton will be moving at a slower speed after exiting point p than before entering it.

If the proton were moving at the same speed after entering point P as it was before then it would be impossible for it to slow down because at the same speed it would have to enter and exit point p from the same direction.

This is impossible due to friction and other forces within point p that slow down a moving body.